| Message ID | 20230417205048.15870-5-vishal.moola@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Split ptdesc from struct page | expand |
Hi Vishal,
kernel test robot noticed the following build errors:
[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on s390/features powerpc/next powerpc/fixes geert-m68k/for-next geert-m68k/for-linus linus/master v6.3-rc7 next-20230417]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Vishal-Moola-Oracle/s390-Use-_pt_s390_gaddr-for-gmap-address-tracking/20230418-045832
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20230417205048.15870-5-vishal.moola%40gmail.com
patch subject: [PATCH 04/33] mm: add utility functions for ptdesc
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20230418/202304180913.p1BuXrBb-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/1b6f8137ca50a543ad2937092836635ca58c78ce
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Vishal-Moola-Oracle/s390-Use-_pt_s390_gaddr-for-gmap-address-tracking/20230418-045832
git checkout 1b6f8137ca50a543ad2937092836635ca58c78ce
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh prepare
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304180913.p1BuXrBb-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
In file included from arch/sh/kernel/asm-offsets.c:14:
include/linux/mm.h: In function 'virt_to_ptdesc':
>> include/linux/mm.h:2723:16: error: implicit declaration of function 'page_ptdesc' [-Werror=implicit-function-declaration]
2723 | return page_ptdesc(virt_to_head_page(x));
| ^~~~~~~~~~~
>> include/linux/mm.h:2723:16: warning: returning 'int' from a function with return type 'struct ptdesc *' makes pointer from integer without a cast [-Wint-conversion]
2723 | return page_ptdesc(virt_to_head_page(x));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from arch/sh/include/asm/thread_info.h:13,
from include/linux/thread_info.h:60,
from include/asm-generic/preempt.h:5,
from ./arch/sh/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:56,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:7,
from include/linux/mm.h:7:
include/linux/mm.h: In function 'ptdesc_to_virt':
>> include/linux/mm.h:2728:29: error: implicit declaration of function 'ptdesc_page'; did you mean 'pte_page'? [-Werror=implicit-function-declaration]
2728 | return page_to_virt(ptdesc_page(pt));
| ^~~~~~~~~~~
arch/sh/include/asm/page.h:139:27: note: in definition of macro '___va'
139 | #define ___va(x) ((x)+PAGE_OFFSET)
| ^
include/linux/mm.h:117:25: note: in expansion of macro '__va'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~
include/linux/mm.h:117:30: note: in expansion of macro 'PFN_PHYS'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~~~~~
include/asm-generic/memory_model.h:64:21: note: in expansion of macro '__page_to_pfn'
64 | #define page_to_pfn __page_to_pfn
| ^~~~~~~~~~~~~
include/linux/mm.h:2728:16: note: in expansion of macro 'page_to_virt'
2728 | return page_to_virt(ptdesc_page(pt));
| ^~~~~~~~~~~~
>> include/asm-generic/memory_model.h:46:35: warning: initialization of 'const struct page *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
46 | ({ const struct page *__pg = (pg); \
| ^
arch/sh/include/asm/page.h:139:27: note: in definition of macro '___va'
139 | #define ___va(x) ((x)+PAGE_OFFSET)
| ^
include/linux/mm.h:117:25: note: in expansion of macro '__va'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~
include/linux/mm.h:117:30: note: in expansion of macro 'PFN_PHYS'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~~~~~
include/asm-generic/memory_model.h:64:21: note: in expansion of macro '__page_to_pfn'
64 | #define page_to_pfn __page_to_pfn
| ^~~~~~~~~~~~~
include/linux/mm.h:117:39: note: in expansion of macro 'page_to_pfn'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~~~~~~~~
include/linux/mm.h:2728:16: note: in expansion of macro 'page_to_virt'
2728 | return page_to_virt(ptdesc_page(pt));
| ^~~~~~~~~~~~
include/linux/mm.h: In function 'ptdesc_address':
>> include/linux/mm.h:2733:30: error: implicit declaration of function 'ptdesc_folio'; did you mean 'page_folio'? [-Werror=implicit-function-declaration]
2733 | return folio_address(ptdesc_folio(pt));
| ^~~~~~~~~~~~
| page_folio
>> include/linux/mm.h:2733:30: warning: passing argument 1 of 'folio_address' makes pointer from integer without a cast [-Wint-conversion]
2733 | return folio_address(ptdesc_folio(pt));
| ^~~~~~~~~~~~~~~~
| |
| int
include/linux/mm.h:2151:55: note: expected 'const struct folio *' but argument is of type 'int'
2151 | static inline void *folio_address(const struct folio *folio)
| ~~~~~~~~~~~~~~~~~~~~^~~~~
include/linux/mm.h: In function 'ptdesc_is_reserved':
>> include/linux/mm.h:2738:36: warning: passing argument 1 of 'folio_test_reserved' makes pointer from integer without a cast [-Wint-conversion]
2738 | return folio_test_reserved(ptdesc_folio(pt));
| ^~~~~~~~~~~~~~~~
| |
| int
In file included from include/linux/mmzone.h:23:
include/linux/page-flags.h:375:62: note: expected 'struct folio *' but argument is of type 'int'
375 | static __always_inline bool folio_test_##lname(struct folio *folio) \
| ~~~~~~~~~~~~~~^~~~~
include/linux/page-flags.h:423:9: note: in expansion of macro 'TESTPAGEFLAG'
423 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:494:1: note: in expansion of macro 'PAGEFLAG'
494 | PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND)
| ^~~~~~~~
include/linux/mm.h: In function 'ptdesc_alloc':
include/linux/mm.h:2745:16: warning: returning 'int' from a function with return type 'struct ptdesc *' makes pointer from integer without a cast [-Wint-conversion]
2745 | return page_ptdesc(page);
| ^~~~~~~~~~~~~~~~~
include/linux/mm.h: In function 'ptdesc_free':
>> include/linux/mm.h:2750:29: warning: initialization of 'struct page *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
2750 | struct page *page = ptdesc_page(pt);
| ^~~~~~~~~~~
include/linux/mm.h: In function 'free_reserved_ptdesc':
>> include/linux/mm.h:2988:28: warning: passing argument 1 of 'free_reserved_page' makes pointer from integer without a cast [-Wint-conversion]
2988 | free_reserved_page(ptdesc_page(pt));
| ^~~~~~~~~~~~~~~
| |
| int
include/linux/mm.h:2971:52: note: expected 'struct page *' but argument is of type 'int'
2971 | static inline void free_reserved_page(struct page *page)
| ~~~~~~~~~~~~~^~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:114: arch/sh/kernel/asm-offsets.s] Error 1
make[2]: Target 'prepare' not remade because of errors.
make[1]: *** [Makefile:1286: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:226: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.
vim +/page_ptdesc +2723 include/linux/mm.h
2720
2721 static inline struct ptdesc *virt_to_ptdesc(const void *x)
2722 {
> 2723 return page_ptdesc(virt_to_head_page(x));
2724 }
2725
2726 static inline void *ptdesc_to_virt(struct ptdesc *pt)
2727 {
> 2728 return page_to_virt(ptdesc_page(pt));
2729 }
2730
2731 static inline void *ptdesc_address(struct ptdesc *pt)
2732 {
> 2733 return folio_address(ptdesc_folio(pt));
2734 }
2735
2736 static inline bool ptdesc_is_reserved(struct ptdesc *pt)
2737 {
> 2738 return folio_test_reserved(ptdesc_folio(pt));
2739 }
2740
2741 static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order)
2742 {
2743 struct page *page = alloc_pages(gfp | __GFP_COMP, order);
2744
2745 return page_ptdesc(page);
2746 }
2747
2748 static inline void ptdesc_free(struct ptdesc *pt)
2749 {
> 2750 struct page *page = ptdesc_page(pt);
2751
2752 __free_pages(page, compound_order(page));
2753 }
2754
On Mon, Apr 17, 2023 at 01:50:19PM -0700, Vishal Moola wrote: > Introduce utility functions setting the foundation for ptdescs. These > will also assist in the splitting out of ptdesc from struct page. > > ptdesc_alloc() is defined to allocate new ptdesc pages as compound > pages. This is to standardize ptdescs by allowing for one allocation > and one free function, in contrast to 2 allocation and 2 free functions. > > Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> > --- > include/asm-generic/tlb.h | 11 ++++++++++ > include/linux/mm.h | 44 +++++++++++++++++++++++++++++++++++++++ > include/linux/pgtable.h | 13 ++++++++++++ > 3 files changed, 68 insertions(+) > > diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h > index b46617207c93..6bade9e0e799 100644 > --- a/include/asm-generic/tlb.h > +++ b/include/asm-generic/tlb.h > @@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) > return tlb_remove_page_size(tlb, page, PAGE_SIZE); > } > > +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt) > +{ > + tlb_remove_table(tlb, pt); > +} > + > +/* Like tlb_remove_ptdesc, but for page-like page directories. */ > +static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt) > +{ > + tlb_remove_page(tlb, ptdesc_page(pt)); > +} > + > static inline void tlb_change_page_size(struct mmu_gather *tlb, > unsigned int page_size) > { > diff --git a/include/linux/mm.h b/include/linux/mm.h > index b18848ae7e22..ec3cbe2fa665 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -2744,6 +2744,45 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a > } > #endif /* CONFIG_MMU */ > > +static inline struct ptdesc *virt_to_ptdesc(const void *x) > +{ > + return page_ptdesc(virt_to_head_page(x)); > +} > + > +static inline void *ptdesc_to_virt(struct ptdesc *pt) > +{ > + return page_to_virt(ptdesc_page(pt)); > +} > + > +static inline void *ptdesc_address(struct ptdesc *pt) > +{ > + return folio_address(ptdesc_folio(pt)); > +} > + > +static inline bool ptdesc_is_reserved(struct ptdesc *pt) > +{ > + return folio_test_reserved(ptdesc_folio(pt)); > +} > + > +static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order) > +{ > + struct page *page = alloc_pages(gfp | __GFP_COMP, order); > + > + return page_ptdesc(page); > +} > + > +static inline void ptdesc_free(struct ptdesc *pt) > +{ > + struct page *page = ptdesc_page(pt); > + > + __free_pages(page, compound_order(page)); > +} > + > +static inline void ptdesc_clear(void *x) > +{ > + clear_page(x); > +} > + > #if USE_SPLIT_PTE_PTLOCKS > #if ALLOC_SPLIT_PTLOCKS > void __init ptlock_cache_init(void); > @@ -2970,6 +3009,11 @@ static inline void mark_page_reserved(struct page *page) > adjust_managed_page_count(page, -1); > } > > +static inline void free_reserved_ptdesc(struct ptdesc *pt) > +{ > + free_reserved_page(ptdesc_page(pt)); > +} > + > /* > * Default method to free all the __init memory into the buddy system. > * The freed pages will be poisoned with pattern "poison" if it's within > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > index 7cc6ea057ee9..7cd803aa38eb 100644 > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -97,6 +97,19 @@ TABLE_MATCH(ptl, ptl); > #undef TABLE_MATCH > static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); > > +#define ptdesc_page(pt) (_Generic((pt), \ > + const struct ptdesc *: (const struct page *)(pt), \ > + struct ptdesc *: (struct page *)(pt))) > + > +#define ptdesc_folio(pt) (_Generic((pt), \ > + const struct ptdesc *: (const struct folio *)(pt), \ > + struct ptdesc *: (struct folio *)(pt))) > + > +static inline struct ptdesc *page_ptdesc(struct page *page) > +{ > + return (struct ptdesc *)page; > +} Hi Vishal, I'm a little curious, why is the page_ptdesc() using inline functions instead of macro? If this is any magic, please tell me, thank you very much. > + > /* > * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD] > * > > -- > 2.39.2 >
On Wed, Apr 19, 2023 at 6:34 AM Vernon Yang <vernon2gm@gmail.com> wrote: > > On Mon, Apr 17, 2023 at 01:50:19PM -0700, Vishal Moola wrote: > > Introduce utility functions setting the foundation for ptdescs. These > > will also assist in the splitting out of ptdesc from struct page. > > > > ptdesc_alloc() is defined to allocate new ptdesc pages as compound > > pages. This is to standardize ptdescs by allowing for one allocation > > and one free function, in contrast to 2 allocation and 2 free functions. > > > > Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> > > --- > > include/asm-generic/tlb.h | 11 ++++++++++ > > include/linux/mm.h | 44 +++++++++++++++++++++++++++++++++++++++ > > include/linux/pgtable.h | 13 ++++++++++++ > > 3 files changed, 68 insertions(+) > > > > diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h > > index b46617207c93..6bade9e0e799 100644 > > --- a/include/asm-generic/tlb.h > > +++ b/include/asm-generic/tlb.h > > @@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) > > return tlb_remove_page_size(tlb, page, PAGE_SIZE); > > } > > > > +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt) > > +{ > > + tlb_remove_table(tlb, pt); > > +} > > + > > +/* Like tlb_remove_ptdesc, but for page-like page directories. */ > > +static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt) > > +{ > > + tlb_remove_page(tlb, ptdesc_page(pt)); > > +} > > + > > static inline void tlb_change_page_size(struct mmu_gather *tlb, > > unsigned int page_size) > > { > > diff --git a/include/linux/mm.h b/include/linux/mm.h > > index b18848ae7e22..ec3cbe2fa665 100644 > > --- a/include/linux/mm.h > > +++ b/include/linux/mm.h > > @@ -2744,6 +2744,45 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a > > } > > #endif /* CONFIG_MMU */ > > > > +static inline struct ptdesc *virt_to_ptdesc(const void *x) > > +{ > > + return page_ptdesc(virt_to_head_page(x)); > > +} > > + > > +static inline void *ptdesc_to_virt(struct ptdesc *pt) > > +{ > > + return page_to_virt(ptdesc_page(pt)); > > +} > > + > > +static inline void *ptdesc_address(struct ptdesc *pt) > > +{ > > + return folio_address(ptdesc_folio(pt)); > > +} > > + > > +static inline bool ptdesc_is_reserved(struct ptdesc *pt) > > +{ > > + return folio_test_reserved(ptdesc_folio(pt)); > > +} > > + > > +static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order) > > +{ > > + struct page *page = alloc_pages(gfp | __GFP_COMP, order); > > + > > + return page_ptdesc(page); > > +} > > + > > +static inline void ptdesc_free(struct ptdesc *pt) > > +{ > > + struct page *page = ptdesc_page(pt); > > + > > + __free_pages(page, compound_order(page)); > > +} > > + > > +static inline void ptdesc_clear(void *x) > > +{ > > + clear_page(x); > > +} > > + > > #if USE_SPLIT_PTE_PTLOCKS > > #if ALLOC_SPLIT_PTLOCKS > > void __init ptlock_cache_init(void); > > @@ -2970,6 +3009,11 @@ static inline void mark_page_reserved(struct page *page) > > adjust_managed_page_count(page, -1); > > } > > > > +static inline void free_reserved_ptdesc(struct ptdesc *pt) > > +{ > > + free_reserved_page(ptdesc_page(pt)); > > +} > > + > > /* > > * Default method to free all the __init memory into the buddy system. > > * The freed pages will be poisoned with pattern "poison" if it's within > > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > > index 7cc6ea057ee9..7cd803aa38eb 100644 > > --- a/include/linux/pgtable.h > > +++ b/include/linux/pgtable.h > > @@ -97,6 +97,19 @@ TABLE_MATCH(ptl, ptl); > > #undef TABLE_MATCH > > static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); > > > > +#define ptdesc_page(pt) (_Generic((pt), \ > > + const struct ptdesc *: (const struct page *)(pt), \ > > + struct ptdesc *: (struct page *)(pt))) > > + > > +#define ptdesc_folio(pt) (_Generic((pt), \ > > + const struct ptdesc *: (const struct folio *)(pt), \ > > + struct ptdesc *: (struct folio *)(pt))) > > + > > +static inline struct ptdesc *page_ptdesc(struct page *page) > > +{ > > + return (struct ptdesc *)page; > > +} > > Hi Vishal, > > I'm a little curious, why is the page_ptdesc() using inline functions instead of macro? > If this is any magic, please tell me, thank you very much. No magic here, I was mainly basing it off Matthew's netmem series. I'm not too clear on when to use macros vs inlines myself :/. If there's a benefit to having it be a macro let me know and I can make that change in v2.
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index b46617207c93..6bade9e0e799 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) return tlb_remove_page_size(tlb, page, PAGE_SIZE); } +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt) +{ + tlb_remove_table(tlb, pt); +} + +/* Like tlb_remove_ptdesc, but for page-like page directories. */ +static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt) +{ + tlb_remove_page(tlb, ptdesc_page(pt)); +} + static inline void tlb_change_page_size(struct mmu_gather *tlb, unsigned int page_size) { diff --git a/include/linux/mm.h b/include/linux/mm.h index b18848ae7e22..ec3cbe2fa665 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2744,6 +2744,45 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a } #endif /* CONFIG_MMU */ +static inline struct ptdesc *virt_to_ptdesc(const void *x) +{ + return page_ptdesc(virt_to_head_page(x)); +} + +static inline void *ptdesc_to_virt(struct ptdesc *pt) +{ + return page_to_virt(ptdesc_page(pt)); +} + +static inline void *ptdesc_address(struct ptdesc *pt) +{ + return folio_address(ptdesc_folio(pt)); +} + +static inline bool ptdesc_is_reserved(struct ptdesc *pt) +{ + return folio_test_reserved(ptdesc_folio(pt)); +} + +static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order) +{ + struct page *page = alloc_pages(gfp | __GFP_COMP, order); + + return page_ptdesc(page); +} + +static inline void ptdesc_free(struct ptdesc *pt) +{ + struct page *page = ptdesc_page(pt); + + __free_pages(page, compound_order(page)); +} + +static inline void ptdesc_clear(void *x) +{ + clear_page(x); +} + #if USE_SPLIT_PTE_PTLOCKS #if ALLOC_SPLIT_PTLOCKS void __init ptlock_cache_init(void); @@ -2970,6 +3009,11 @@ static inline void mark_page_reserved(struct page *page) adjust_managed_page_count(page, -1); } +static inline void free_reserved_ptdesc(struct ptdesc *pt) +{ + free_reserved_page(ptdesc_page(pt)); +} + /* * Default method to free all the __init memory into the buddy system. * The freed pages will be poisoned with pattern "poison" if it's within diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 7cc6ea057ee9..7cd803aa38eb 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -97,6 +97,19 @@ TABLE_MATCH(ptl, ptl); #undef TABLE_MATCH static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); +#define ptdesc_page(pt) (_Generic((pt), \ + const struct ptdesc *: (const struct page *)(pt), \ + struct ptdesc *: (struct page *)(pt))) + +#define ptdesc_folio(pt) (_Generic((pt), \ + const struct ptdesc *: (const struct folio *)(pt), \ + struct ptdesc *: (struct folio *)(pt))) + +static inline struct ptdesc *page_ptdesc(struct page *page) +{ + return (struct ptdesc *)page; +} + /* * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD] *
Introduce utility functions setting the foundation for ptdescs. These will also assist in the splitting out of ptdesc from struct page. ptdesc_alloc() is defined to allocate new ptdesc pages as compound pages. This is to standardize ptdescs by allowing for one allocation and one free function, in contrast to 2 allocation and 2 free functions. Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> --- include/asm-generic/tlb.h | 11 ++++++++++ include/linux/mm.h | 44 +++++++++++++++++++++++++++++++++++++++ include/linux/pgtable.h | 13 ++++++++++++ 3 files changed, 68 insertions(+)